Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04a35b32f13bbf3…

MALICIOUS

PDF

80.1 KB Created: 2021-05-14 13:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b845eaa9b904ecbda034afe28e29b932 SHA-1: 529c631172427d51e8c8098a37d0bb6e6fa77f48 SHA-256: d04a35b32f13bbf395daec4788750badc16c6aed681fde7a5dd7bd8d357f9e5b
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of numerous external URIs and the PDF_SEO_LINK_FARM heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://resalured.ru/strik?utm_term=what+is+bir+1902+form PDF link annotation
    • http://parralax.net/57939890985xycbx.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/gSic3EZ/pixikafakupuzipelusukiseg.pdfIn PDF document text
    • https://cdn.sqhk.co/gidulikegel/KUtjccp/cartoon_network_art_style.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxiwugo/iihnYbJ/vouloir_conjugation_lawless_french.pdfIn PDF document text
    • http://skywonder.space/what_is_the_symbolism_of_the_cruciblej44nf.pdfIn PDF document text
    • https://cdn.sqhk.co/rolidazi/rgc40Fo/go_planet_enschede_bowling.pdfIn PDF document text
    • http://madewithsunshine.com/mebexiraxxe7z1.pdfIn PDF document text
    • http://gedozudusinap.mygamesonline.org/armonicas_electricas.pdfIn PDF document text
    • http://makeyourself.xyz/thoracic_outlet_syndrome_symptoms_facial_numbnesspo28q.pdfIn PDF document text
    • https://cdn.sqhk.co/mibupufek/jewItji/fikavonusesopomovifadijif.pdfIn PDF document text
    • http://yewes.space/diagnostico_por_imagen_pedrosarlhsd.pdfIn PDF document text
    • https://cdn.sqhk.co/ferobisuw/ighDZ3h/ninja_dashing_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/kNhcwhf/mastercraft_boat_prices.pdfIn PDF document text
    • http://rankingcoach-apps.com/ap_english_language_and_composition_2020_examavq4b.pdfIn PDF document text
    • https://cdn.sqhk.co/tuledapozato/agdsWhg/73089216270.pdfIn PDF document text
    • http://lakcherie.ru/22429772765mz8i7.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwozobo/zISKOjj/minukonujedowukawowe.pdfIn PDF document text
    • http://trackcreditscore.info/how_old_is_a_k5ss_kitchenaid_mixerazssn.pdfIn PDF document text
    • http://zekaxezixil.medianewsonline.com/48215565492.pdfIn PDF document text
    • http://alsamcctv.com/gopro_hero_4_silver_wont_updateboqla.pdfIn PDF document text
    • http://lilozekakotelup.sportsontheweb.net/bank_po_book_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tediguku.atwebpages.com/zudalowofavofutoxegoxutu.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_f5298bfb5aa442d8bafe257b17a85423.pdf?index=trueIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_28de91ce0736411c8dab9b955ff10499.pdf?index=trueIn 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_off0000f87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 5608 bytes
SHA-256: 89c388427180e6f93487e27d948cae385b533ae41d92ca27845cf624fa4313f8
font_01_sfnt_off00010b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 11344 bytes
SHA-256: 030babaf8d1af004a06420cdcc3bb463682bb8b9a4e239c8f1af55657848ddf7