Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7aa6f8828642fcb…

MALICIOUS

PDF

81.7 KB Created: 2021-03-29 16:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbac4f8671c2c2816f490c9769750849 SHA-1: 4b739fdf130ffdad45dd41b1b2394eb71276473c SHA-256: a7aa6f8828642fcba4b468ccf5baa206a355ad110f3dbd3e942a3ba87fca80f1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to a link farm hosted on weebly.com, suggesting a tactic to inflate search engine rankings or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/award?keyword=el+autoestima+en+los+adolescentes+pdf
    • https://kunolutupevuj.weebly.com/uploads/1/3/4/7/134772201/59e2fa.pdf
    • https://davixiwawelugez.weebly.com/uploads/1/3/4/1/134133028/terapajugumimuj.pdf
    • https://lewobagapu.weebly.com/uploads/1/3/4/6/134666085/defokuvinad-sidolaxoxek-nopifanuza.pdf
    • https://cdn.sqhk.co/sixojifez/BsjiAUm/photo_studio_near_to_me.pdf
    • https://nudezodubazez.weebly.com/uploads/1/3/1/1/131164524/fasawurojab.pdf
    • https://bediwejuze.weebly.com/uploads/1/3/4/8/134899819/5772186.pdf
    • https://ledijonag.weebly.com/uploads/1/3/4/6/134689342/wutopapotaxavube.pdf
    • https://cdn.sqhk.co/kupejabel/g3hfibt/bosili.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_9152ad1bca6b4ce8bf93e033bd273487.pdf?index=true
    • https://s3.amazonaws.com/jesidofefe/nipofidemasakogo.pdf
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_2dd89ac4710e4a23a66c0875f508726a.pdf?index=true
    • https://s3.amazonaws.com/fuzafuzeruwit/80709092368.pdf
    • https://s3.amazonaws.com/jesidofefe/39524158052.pdf
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_dda1e0777f24473c86906504633786be.pdf?index=true
    • https://c11ab09e-384c-4904-8c79-5ef6f38008df.filesusr.com/ugd/7131a6_1df94b972613472d859eecb33a90691a.pdf?index=true
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_457f49828ccc4fddacd847a606479eb6.pdf?index=true
    • https://s3.amazonaws.com/goneduzum/18469600949.pdf
    • https://bfb79b04-db4d-4c54-a74a-4733ff68ceb9.filesusr.com/ugd/11291b_33daff5fc79143baaa1f599c11ac735c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fff0.bin
37a890fe230f4afdf2ee39d6e3d35856cd94532bd7a93442ae5071b2cfd8818a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF0 5164 bytes
font_01_sfnt_off00011178.bin
4c8b8b45f60e76094cb855b80eee2afee24885396c5d5700cc4b89234b143386		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 11612 bytes

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