Malicious PDF — malware analysis report

Static analysis result for SHA-256 0063a95bd442277a…

MALICIOUS

PDF

76.5 KB Created: 2021-04-20 17:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c9feb034e4e0eab56cc2ea6580b84a38 SHA-1: b8026d9664c46bd1a660d415dcd0675ddd53a4f1 SHA-256: 0063a95bd442277a74b1b38c27ebe4b8e38f24bb352a68eb3067515a75db7d84
196 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many of which point to redirectors or SEO-optimized pages, indicating a link farm strategy. The primary malicious URL identified is https://bologen.ru/strik?utm_term=will+there+be+a+fourth+divergent+book, which is likely used to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=will+there+be+a+fourth+divergent+book PDF link annotation
    • https://cdn.sqhk.co/noruwotil/ggePi4C/liverpool_vs_bayern_munich_bleacher_report.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/best_spanish_books_in_englishoiv6w.pdfIn PDF document text
    • http://specrazreshenie.com/intraoperative_awareness_guidelinejtvt0.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/5kAqPjf/80170162713.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/benjamin_graham_security_analysis_free_download.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/etika_komunikasi_di_media_sosial.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/4f6acff5-2cce-4c21-8772-03a5f4de5776/calories_in_old_school_bagel_cafe.pdfIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_87f6065e3a8742e7b7b744a7a858274a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liwara/citra_emulator_android_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/67662788529.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/despacito_lyrics_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/is_the_book_little_fires_everywhere_based_on_a_true_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44f5995b-6133-4b93-b110-df414a793241/what_schools_offer_real_estate_courses_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a10a528f-eb37-49bc-9092-089f2184f197/pirates_of_the_caribbean_up_is_down_flute_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/fizolusunilovofijazevi.pdfIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_ca4d765879214b7abd39ad6848566e3a.pdf?index=trueIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_57b868a1750f449f9593059352972e23.pdf?index=trueIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_655c410eb7ae4aca9c40e88d3d6453d6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e27ddfa-edd8-4d9d-8ef0-7491d7806294/madaripefotubedonenat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc11534-4ec8-4122-bb64-33051c9a240f/kutivowatewokeforisewo.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_off0000eb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 5268 bytes
SHA-256: a5a2f66d8f8d86861a32383fd93cfcbf4c6fe6a762190263174f2b35385a7ce7
font_01_sfnt_off0000fd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD36 11148 bytes
SHA-256: 0d59ea933e5a846315881648e50be768b130547b0de2f6a23520a87abf8fb1d9