Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd82c8099208710…

MALICIOUS

PDF

74.1 KB Created: 2021-03-23 05:58:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9167821d8a2cb0fcc407d6eb5dc7d2c4 SHA-1: ac77dd62bc7259b3a36e8f13d25f3341a0c77385 SHA-256: 0cd82c80992087103ba9abda82d5e24864c930be143fb0faae8056fcb9662fff
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jumiwimov.ru/aws?utm_term=autocad+2020+3d+tutorial+for+beginners
    • https://wakavofidokevi.weebly.com/uploads/1/3/2/6/132681750/4b7a563.pdf
    • https://cdn-cms.f-static.net/uploads/4410975/normal_6018851b2ba3f.pdf
    • https://static.s123-cdn-static.com/uploads/4473030/normal_5fca66bf8a8a7.pdf
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/7771169.pdf
    • https://cdn-cms.f-static.net/uploads/4470687/normal_60390945187ab.pdf
    • https://cdn-cms.f-static.net/uploads/4454691/normal_603c40e8db423.pdf
    • http://komakukamuduwi.iblogger.org/short_essay_on_my_pet_dog_in_hindi.pdf
    • https://cdn-cms.f-static.net/uploads/4375087/normal_600e047c45c38.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_ca6160e16080453a861237b685bd3816.pdf?index=true
    • https://uploads.strikinglycdn.com/files/298bdd91-f0f6-4b90-a64c-02f3f211d25c/74502998023.pdf
    • http://katosijuxemewex.rf.gd/wumabetuzafilugofonis.pdf
    • https://60883313-e483-4213-bdf2-3844198a3b35.filesusr.com/ugd/3ba96b_0465bccdd72749a4b267de334e2d756b.pdf?index=true
    • https://a29d81ee-e589-4368-99bd-4e0be04eb4c0.filesusr.com/ugd/a89e6e_b80f4cf2fa3f4552b88a72e1b070b5c5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/94432794-f8ed-4113-a923-62d92da0f9dc/renawajalagenevetedigopi.pdf
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_983b510508fc438d9e771ee804e97e31.pdf?index=true
    • http://boganarupimuga.epizy.com/jonumu.pdf
    • https://5c51e3d7-2896-491e-a255-1b002e356b93.filesusr.com/ugd/5b6ce5_d44adebf28c64a23a20ba3592ad91774.pdf?index=true
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_50198979fe4541dc849d32bf561e4bbb.pdf?index=true
    • http://zerejikeneto.rf.gd/notitubuvawidaju.pdf
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_09dec39ddc5c4914b6822ec4762be4f9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dad25a9c-d18c-43e9-a9b0-804a7f5c2aeb/rukugenirijenuxawukejad.pdf
    • https://uploads.strikinglycdn.com/files/406aa27a-d482-40f5-b0b5-495ea38d01e0/burnham_es2_boiler_reviews.pdf
    • https://7a6021ad-ea99-40b3-bafb-6570e045b460.filesusr.com/ugd/527ec5_df3797add40b471c8d259dea54441808.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_off0000e429.bin
cfbfc823efb985b0effd92bb31e6bd8b383fa727cb4c67d501691fb5b8131af2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 5756 bytes
font_01_sfnt_off0000f7d2.bin
914255ba01f8a4ff5c38ed6c6a34ef27ee1a3ee3e5b5f2b5339b980e50eddc42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 10216 bytes

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