Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cefaffa282e729e…

MALICIOUS

PDF

95.6 KB Created: 2021-04-07 11:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c10a46c6deb754045e3bac1b47d778c SHA-1: 61863bdcfa856732fba2a4234090883926af698b SHA-256: 8cefaffa282e729edba8e6f59edacd75547ed484ba1135a257b36a07ff5eb090
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm designed to direct users to a large number of other PDFs. The embedded URLs and the ClamAV detection strongly indicate a phishing and potential trojan distribution attempt. While no scripts were explicitly extracted, the nature of the link farm and the ML classification suggest malicious intent, likely to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://lozipotod.ru/123?utm_term=general+science+reviewer+with+answers+philippines
    • https://xevejepagog.weebly.com/uploads/1/3/4/6/134688444/f264b319553b.pdf
    • https://cdn.sqhk.co/tebolugex/jeyjd7k/war_of_kings_brandon_sanderson.pdf
    • https://cdn-cms.f-static.net/uploads/4529281/normal_603bda3f165a5.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • https://dojibosuxuzepi.weebly.com/uploads/1/3/1/3/131378780/nalaxevajafuxin_zebuda_pusubit_giniborepuzo.pdf
    • http://usacreditreport.info/to_kill_a_mockingbird_quotes_chapter_175k3cc.pdf
    • https://static.s123-cdn-static.com/uploads/4455907/normal_5ffd7c54dca19.pdf
    • http://zeropium.com/video_er_opera_store6fl0o.pdf
    • https://cdn.sqhk.co/padezeda/8Zhcjb7/top_10_newspapers_in_texas.pdf
    • https://cdn-cms.f-static.net/uploads/4496853/normal_5fe9c98d1ab0c.pdf
    • https://xojunujad.weebly.com/uploads/1/3/1/1/131164104/mitege.pdf
    • https://cdn-cms.f-static.net/uploads/4421062/normal_60642c4176d85.pdf
    • https://cdn-cms.f-static.net/uploads/4462730/normal_6019061217422.pdf
    • https://pigixona.weebly.com/uploads/1/3/5/9/135986477/8314096.pdf
    • https://tumenunomowet.weebly.com/uploads/1/3/0/7/130775025/xajebodepomitu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zifilobesumafi/16233584750.pdf
    • https://s3.amazonaws.com/pegek/caractres_spciaux_clavier_android.pdf
    • https://s3.amazonaws.com/polexebuj/73097518439.pdf
    • https://s3.amazonaws.com/dewutexorob/15289488652.pdf
    • https://s3.amazonaws.com/bidemewufa/jufusebureponutaj.pdf
    • https://s3.amazonaws.com/gurupixabogivaz/59557792578.pdf
    • https://s3.amazonaws.com/divikufifir/sea_of_thieves_fishing_bait_guide.pdf
    • https://s3.amazonaws.com/wexukufedepim/dilonobub.pdf
    • https://s3.amazonaws.com/toguvaju/guduwaz.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012182.bin
aa855e9181612048f8a0ecff41fa907b8199189bfedfec58943a234679208a74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12182 5204 bytes
font_01_sfnt_off00013344.bin
3a7fc731b057c66747350a9ac0671f4d2decd231c5721c78d8a2fc12d505ba33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13344 11800 bytes
font_02_sfnt_off00015bad.bin
4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15BAD 16060 bytes

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