Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc916a09b43092a…

MALICIOUS

PDF

86.6 KB Created: 2021-04-09 03:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bc5f178305553a98806e199012ab9e0c SHA-1: e85d72805df62d9def6b2a9810a800265e39e054 SHA-256: 3fc916a09b43092ae384bbf545bf8395a9f2b84ac4ed56c613d657ea27fde72d
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains a large number of embedded links, many of which lead to suspicious or known malicious domains, indicating a link farm designed to redirect users. The presence of ClamAV detection and ML flagging further supports its malicious nature. The document's primary function appears to be directing users to potentially harmful external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/strik?utm_term=a+son+is+a+son+quote In PDF document text
    • http://centerbluebadge.com/mugoxuvibank962z.pdfIn PDF document text
    • http://fakts.design/hebrew_english_interlinear_bible_freeio9g2.pdfIn PDF document text
    • https://dowozazufexu.weebly.com/uploads/1/3/4/6/134606261/sowawurov.pdfIn PDF document text
    • http://raisinshub.pro/algebra_2_chapter_1_test3jhwy.pdfIn PDF document text
    • http://verenica.net/9962945488560sv9.pdfIn PDF document text
    • https://fumaletaseker.weebly.com/uploads/1/3/1/3/131381433/7919805.pdfIn PDF document text
    • https://wupugosow.weebly.com/uploads/1/3/1/3/131382590/dab93feef886da.pdfIn PDF document text
    • http://stylecurtains.com/60078253652o0ki7.pdfIn PDF document text
    • http://auth02mobility.com/harry_potter_and_the_goblet_of_fire_book_bloomsbury3qsxj.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/33833254558xjcg5.pdfIn PDF document text
    • https://gawenowufiwozup.weebly.com/uploads/1/3/1/3/131383543/bexibovadewiw_refop.pdfIn PDF document text
    • http://zootime.store/90935498615lnxg2.pdfIn PDF document text
    • http://jidogirikar.mygamesonline.org/alesis_sr_16_manual_espaol.pdfIn PDF document text
    • http://ig-supportcenter.xyz/97732862832if6u7.pdfIn PDF document text
    • http://ita-bio.space/contemporary_behavior_therapy_spiegleragljq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bac4103-0526-4619-a85d-0e6617095f37/fesuripabamedaxefaxapufiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ff9574-2bb6-4160-ad57-86e4a22025e1/how_to_make_a_pallet_jack_go_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d422672-5929-42af-bfc1-3daa8b3ea312/bird_with_yellow_feet_and_beak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dae7fcb-f407-4d2a-8ad2-67da73a82f54/nuevos_aportes_a_la_teora_del_conflicto_social.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d378c412-d0d8-42e6-9245-cc7dc80325ca/terasic_de10_lite_tutorial.pdfIn PDF document text
    • http://pupowelepidojek.onlinewebshop.net/reading_and_writing_skills_grade_11_deped.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6e3e0f6-9de0-4b33-b1b2-67bdfd1ef228/lg_top_loader_washing_machine_drain_pump_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/014c70b0-98dc-40a7-8d3d-fac4af4049d5/zmodo_mini_wifi_camera_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca8811a4-3579-4343-ac4b-a5942f230c11/how_to_change_oil_on_mtd_snowblower.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B9 4664 bytes
SHA-256: d091c873c6fe1d8ab7ef176f9f7faf3651819d1fecb40dc085cfc0a07eda16b9
font_01_sfnt_off000126ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AD 10940 bytes
SHA-256: 806bc69c916791e25e3cffe41b5939d0aa2fcc84771e4ce0e5e45126947767c0