Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa1f05add9d7af7…

MALICIOUS

PDF

68.9 KB Created: 2021-03-18 01:03:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 347fcd5729e9c57bdbaedb9ab90bf82a SHA-1: 26c6e8009201249b54af33d85022422a13ca09d0 SHA-256: 7aa1f05add9d7af77c68fe6227d080d5d1db3eb6c69c49623273a0a0e5e3084c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/wix?keyword=rms+voltage+worksheet PDF link annotation
    • https://pigasuranebuja.weebly.com/uploads/1/3/4/4/134459694/4671492.pdfIn PDF document text
    • http://midakurapujif.mypressonline.com/bd_chaurasia_vol_3.pdfIn PDF document text
    • https://cdn.sqhk.co/murefazomejo/bopLibo/rejiwake.pdfIn PDF document text
    • http://gavediteriremuv.medianewsonline.com/whale_talk_chapter_14_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/yjbigib/kozomebotuferam.pdfIn PDF document text
    • https://foseduvix.weebly.com/uploads/1/3/4/4/134491956/vusosegirapuze.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/iYhhJ6N/wakezukobujiw.pdfIn PDF document text
    • https://sojurepew.weebly.com/uploads/1/3/5/9/135992925/5274414.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/0593b651-9c9a-4eab-81fa-bcbefb0b8d59/midunobusenedapudunonukig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fe7bc9b-e099-403a-bc07-6370640726ff/how_to_replace_switch_on_rainbow_vacuum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65819062-bb2e-47b7-8123-412202520167/black_hawk_down_untold_story.pdfIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_b4120064c2a9446aa85b78a637b033a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdd7aa7b-af43-4cea-baf7-9905db0912bf/los_juegos_del_hambre_sinsajo_parte_2_reparto.pdfIn PDF document text
    • http://pivimufe.atwebpages.com/the_book_of_questions_pablo_neruda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be104240-e874-4d4a-aa83-4bc1acd71157/road_height_limit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8388d07d-b644-4f87-844e-cd99985f3ef0/86977748965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3321bc15-4aa5-4234-9fff-d4622e15bf5c/49624265515.pdfIn PDF document text
    • https://09d7e2b9-79a3-4876-9e00-73a1ba4263a4.filesusr.com/ugd/92fcd7_ae17d44ef3d242ddb561f2dfc56453d3.pdf?index=trueIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_14d19f9f17654d8c9fcafe638a0bb942.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be1d25e2-cbdf-4c97-b3b9-1cc6b0d195c7/what_happens_when_you_plead_nolo.pdfIn PDF document text
    • http://rulamiji.onlinewebshop.net/igora_royal_e-1_how_to_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8cc46ec-4727-4c65-88a0-e59e90166fa4/is_magicians_season_5_the_last_season.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_off0000cf36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF36 5324 bytes
SHA-256: a07292f4c830410a26d1f7433dda3ebc01db41f74fecc2e08c7dc0b296782987
font_01_sfnt_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 10456 bytes
SHA-256: 0dfaa6d50e691a7eec1801ccbf72c677d67a4a84a4689c99d6512396f121abf9