Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7a3a7c2fe705f3…

MALICIOUS

PDF

69.6 KB Created: 2021-04-01 01:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00eb5664fdba27d9d9683d309ea84f7d SHA-1: d28aeeebe262e973d4af907391b1f28e35af2e47 SHA-256: 3b7a3a7c2fe705f33d60fee53e876ab6efb9309a511937b55234c8f5cf9252fc
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 point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The embedded URLs are likely used to redirect users to further malicious content or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=aashto+standard+specifications+for+highway+bridges+17th+edition+pdf
    • https://cdn-cms.f-static.net/uploads/4374986/normal_603f50df9c074.pdf
    • https://cdn-cms.f-static.net/uploads/4416660/normal_5fd9b6d94e41e.pdf
    • https://cdn-cms.f-static.net/uploads/4391909/normal_602ee33cf39ce.pdf
    • https://sedivunoruset.weebly.com/uploads/1/3/4/8/134859312/zojeri.pdf
    • https://zomuwobab.weebly.com/uploads/1/3/0/8/130873958/304f058dc9f.pdf
    • https://kurakozizuvev.weebly.com/uploads/1/3/2/6/132681999/nelerebizarutowazig.pdf
    • https://basotode.weebly.com/uploads/1/3/4/6/134691624/pilub_xulipadifojalaz_tifusabole.pdf
    • https://cdn-cms.f-static.net/uploads/4461211/normal_6064e9e3971ab.pdf
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/fakivasag_kaner.pdf
    • https://cdn-cms.f-static.net/uploads/4414691/normal_5fd17f53a77fd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_f29aea53579c4c888de89ec11022a909.pdf?index=true
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_41cbbee11f9f48059e0ed07aad218bed.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bafa09f9-01d1-4276-815d-38a5509b9915/xutudofejoromuviwidoru.pdf
    • https://uploads.strikinglycdn.com/files/6620150f-6dc1-4d53-82f1-85939bb4d0a5/which_honeywell_air_purifier_is_the_best.pdf
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_7ce3be79dcbb45f1bb20d7bd2abde803.pdf?index=true
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_027b7e06f4ec4a6ea3411426779fe3e9.pdf?index=true
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_d5f74f544cf94489958761b3ba342165.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b3bba3f4-4f68-43bc-93a9-56f626187519/tuvol.pdf
    • https://uploads.strikinglycdn.com/files/13bda242-eda2-42f6-9f59-cc57b16af4ed/cub_cadet_lt1046_mower_deck_belt.pdf
    • https://uploads.strikinglycdn.com/files/f2fd00d7-c2ab-4ddc-a9db-8e4b07161c65/tenivexiwupasawepop.pdf
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_295d72731dbd4cafb26d315a42ac1a8b.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_off0000d0e7.bin
ea4a28c40c06d31deb68431eaf55c3f507bfbe4da5f7cf2e317ca9c55b15e06c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E7 5840 bytes
font_01_sfnt_off0000e4e6.bin
0649e0b341253b3d0574076a4b79af449f14b6547252546edd75bde6192daa0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E6 10436 bytes

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