Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f7b5718afbd89d…

MALICIOUS

PDF

72.4 KB Created: 2021-04-01 05:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b5585d9872acf7ff9ed8ad795eaca126 SHA-1: 31509684926ec321e414147173fc1445b4526740 SHA-256: a4f7b5718afbd89de6f3aeb48121bcf3930dbd4c98065c3687244a648b77db0e
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic indicates a 'PDF_SEO_LINK_FARM' with a high number of external links, and another highlights a 'PDF_SEO_UTM_REDIRECTOR_LINK' pointing to 'https://bologen.ru/123?utm_term=bootstrap+table+footer+formatter'. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically identified as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/123?utm_term=bootstrap+table+footer+formatter PDF link annotation
    • https://motubisirewu.weebly.com/uploads/1/3/4/5/134529252/vidoba_bodaliwefebanu_kasajapig_gilavut.pdfIn PDF document text
    • https://tatelemu.weebly.com/uploads/1/3/1/1/131164239/1167773.pdfIn PDF document text
    • https://megevoweroke.weebly.com/uploads/1/3/5/3/135351245/592ae4408.pdfIn PDF document text
    • https://xekekulok.weebly.com/uploads/1/3/1/8/131857590/6537424.pdfIn PDF document text
    • https://cdn.sqhk.co/wexopaxine/eiciabK/90263686810.pdfIn PDF document text
    • https://gofuzuxelizexo.weebly.com/uploads/1/3/5/3/135391542/5f04b1e.pdfIn PDF document text
    • https://xurugafidas.weebly.com/uploads/1/3/6/0/136081795/jajim.pdfIn PDF document text
    • https://nenesezeli.weebly.com/uploads/1/3/0/7/130775424/jasudusemuxojonemo.pdfIn PDF document text
    • https://fiwirozubaxezu.weebly.com/uploads/1/3/4/6/134659856/7287531.pdfIn PDF document text
    • https://cdn.sqhk.co/givifevulo/if69ihS/iowa_farmer_today_subscription.pdfIn PDF document text
    • https://wajifisawebe.weebly.com/uploads/1/3/4/4/134480175/4919591.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xopugup/62475695225.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/autocad_software_2007_64_bit_free.pdfIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_110fd6e8de384aab952c23ff4d423930.pdf?index=trueIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_a5dc9bb1fc834056999efdef2ee19603.pdf?index=trueIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_a21f9ca9d0c04d33b5c31f6d8f5c398b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazemi/zetixiketali.pdfIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_186bf5a409bb4db0b3b8b13b276fadc3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/vezekesudofowoditupup.pdfIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_0823a0db04a845f7b6fca87f36d7d62d.pdf?index=trueIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_abe27f4563c3412f9663d8b41606f6d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/bapiwamuxavamejoben.pdfIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_f937758a143e4c1d88db061f923464e2.pdf?index=trueIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_0075e4f2d4ed4415b1714b46ea20bcaf.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_off0000dcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFA 5236 bytes
SHA-256: 902a2e0014586dc30a41fa6aa25fc2d46cb0f941988e8a27805a2022f424c3fc
font_01_sfnt_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 10964 bytes
SHA-256: 1da592f15ae16e57720af5f77031ab7f2e24f8134577f76e4a718f9573c10366

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