Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0b8adde0816b87…

MALICIOUS

PDF

81.3 KB Created: 2021-03-25 10:00:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d8a33cdf4d85c71dde8e572b01c038d0 SHA-1: cabcab22235f03e5a158f4024d48f465821491c3 SHA-256: 6a0b8adde0816b87bce4197d49354400cf4d32ee6d9d289d75593ab08ca3f1ca
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a primary lure pointing to 'https://jumiwimov.ru/award?keyword=attestation+de+t%25C3%25A9moignage+pdf'. This heuristic firing suggests a link farm or phishing attempt disguised as a document. Although no scripts were explicitly extracted, the PDF structure and the presence of external links indicate potential for malicious content delivery, likely via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/award?keyword=attestation+de+t%25C3%25A9moignage+pdf PDF link annotation
    • https://fadasizoguwo.weebly.com/uploads/1/3/6/0/136050507/8226988.pdfIn PDF document text
    • http://worozoxiw.sportsontheweb.net/15690269697.pdfIn PDF document text
    • http://kilijosizujowo.medianewsonline.com/3rd_grade_common_core_math_word_problems.pdfIn PDF document text
    • https://nuduxojobiri.weebly.com/uploads/1/3/4/6/134629521/3731013.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/metric_mania_worksheet_answer_key.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/guwutivupudutu/25706171653.pdfIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_64917b8bebb84c1cba58a7e8a773588b.pdf?index=trueIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_b26a77b743bd4ca99eadca591694f715.pdf?index=trueIn PDF document text
    • http://tavamikilav.myartsonline.com/manual_canon_eos_80d_portugues.pdfIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_33778de47a2247c688541d1e15ec0ee8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/multiplying_and_dividing_decimals_worksheet_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/chamberlain_garage_door_manual_troubleshooting.pdfIn PDF document text
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_8b91644168bf4febadcb94de10279bcb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/xigemeboselanoladepuzalu.pdfIn PDF document text
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_8c3637c2e06a4f2d9328192ccd3f4ae2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/11767050534.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/acer_aspire_f5-571_replace_hard_drive.pdfIn PDF document text
    • http://wepikupovug.myartsonline.com/electronic_signature_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/69826144510.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_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 5364 bytes
SHA-256: 3e688286225f4e2bbb65d17c44ae76769fe70e97c6196106687af1f43327504b
font_01_sfnt_off000111e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E1 11800 bytes
SHA-256: a8e30caa52f6be9ce5a761db87460d2084c80323dd210b3a7633c8586b10fe5b

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