Malicious PDF — malware analysis report

Static analysis result for SHA-256 3667745e645fc32e…

MALICIOUS

PDF

81.8 KB Created: 2021-04-06 16:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1030209b446e45d020ee249098094ac7 SHA-1: 34ea2ec04763424c0f7cc842864ff8d0e6b699b3 SHA-256: 3667745e645fc32e97e03b4c335b9d16758e590d24e0d0b06da1ac98ff762108
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant. The presence of embedded URLs and the PDF structure strongly suggest an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pelibifir.ru/aws?utm_term=what+kind+of+errors+are+in+physics
    • https://tebideronapiza.weebly.com/uploads/1/3/1/4/131483209/lowasu.pdf
    • http://lijonotogi.scienceontheweb.net/the_new_brown_driver_and_briggs_hebrew_and_english_lexicon_of_the_old_testament.pdf
    • http://mokenolovulonom.medianewsonline.com/beyond_meat_ipo_prospectus.pdf
    • https://luxelekite.weebly.com/uploads/1/3/4/6/134656707/175535.pdf
    • https://bikonate.weebly.com/uploads/1/3/4/7/134715396/vamumexi.pdf
    • https://jasumiwadujavik.weebly.com/uploads/1/3/2/7/132741590/saperiwaman_kexerux_tuvared.pdf
    • https://nepagezefo.weebly.com/uploads/1/3/4/4/134472827/rajadawil.pdf
    • http://penexej.mywebcommunity.org/atomic_structure_class_11_cbse.pdf
    • https://zerimesatevig.weebly.com/uploads/1/3/4/8/134879836/gisadi_veluvikov_nademokenof.pdf
    • http://vowugewekoperak.iblogger.org/kemuzabipawixiguseje.pdf
    • https://sijetiwiriwex.weebly.com/uploads/1/3/2/6/132683168/814575.pdf
    • http://pigigozoruda.mypressonline.com/craftsman_zts_7500_parts_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_e766c9cc570e450eb0daf0ac77e8007d.pdf?index=true
    • https://s3.amazonaws.com/xunilukegez/gilaguwajoj.pdf
    • https://s3.amazonaws.com/faluzotixupi/57422170516.pdf
    • https://s3.amazonaws.com/fifomi/77287377292.pdf
    • https://s3.amazonaws.com/wizuluworafid/nespresso_uk_gift_card.pdf
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_3eeb1984bf784610b065ed1f6d8a2f4b.pdf?index=true
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_4502d6c8eadf491ea0fd6bd4fb7e3f4f.pdf?index=true
    • http://nuxumejaxumem.epizy.com/3244720863.pdf
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_bc2b901e4a1543f0a312cfc1c4adbddc.pdf?index=true
    • https://s3.amazonaws.com/fuvidokibet/kenebisuwafi.pdf
    • 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_off00010205.bin
ae85f40824485115ccc82420521d6d933e338cf2efa1711fe83e00cb0d45c188		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10205 5392 bytes
font_01_sfnt_off0001146f.bin
60fb23b2c88d975015c47d86045c15a81481251a875de8c185d542ca78e11b25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1146F 10944 bytes

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