Malicious PDF — malware analysis report

Static analysis result for SHA-256 b806dfd7b96cf935…

MALICIOUS

PDF

84.4 KB Created: 2021-02-21 23:06:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b113e86c8b7e2f2926d814977b640f2e SHA-1: ba53b1cbd780e4b6feb88a24544235f15e3c764f SHA-256: b806dfd7b96cf935b490a76966fe9cfa390595a6a1f55566b322b8d9426baf6f
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, indicating a link farm or phishing attempt. The 'SE_CALLBACK_LURE' heuristic suggests a potential callback phishing or tech-support scam pattern. While no scripts were explicitly extracted, the PDF structure and numerous external URLs strongly suggest an intent to redirect users to malicious sites for credential harvesting or further payload delivery.

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jacksth.ru/strik?utm_term=what+food+builds+mucus
    • https://kibugisire.weebly.com/uploads/1/3/4/0/134018652/lanokirubederenod.pdf
    • https://dawasaga.weebly.com/uploads/1/3/0/9/130969366/vadawegaku_misazafomap_nabodafipad.pdf
    • http://avbox.org/koxawajusajewedununofasvglt.pdf
    • https://cdn.sqhk.co/dumotometapo/hhefjjy/cyberpunk_2077_countdown.pdf
    • https://static.s123-cdn-static.com/uploads/4485149/normal_5ff00dfaec065.pdf
    • https://gekitudofu.weebly.com/uploads/1/3/4/4/134403565/c17b8.pdf
    • https://cdn-cms.f-static.net/uploads/4455370/normal_601c8969d5dfa.pdf
    • https://cdn.sqhk.co/fusajovogi/ZPsDria/romantic_getaways_from_memphis.pdf
    • https://static.s123-cdn-static.com/uploads/4464532/normal_5fedcc2904de6.pdf
    • https://tawozajoruje.weebly.com/uploads/1/3/4/3/134314125/zonodovaxonepuzuwo.pdf
    • https://cdn.sqhk.co/numovasovev/ivNjijd/pulse_oximeter_readings_chart.pdf
    • https://zelelifejoba.weebly.com/uploads/1/3/4/3/134321633/5369375.pdf
    • https://resuzomesidi.weebly.com/uploads/1/3/4/7/134746605/36769eab60b.pdf
    • http://navalny.design/gososujevowodavaxexijtru8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/daselex/ib_bri_mobile.pdf
    • https://s3.amazonaws.com/loranoduzuja/lidapoxe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d17c.bin
ea22a702df719d748d5ec9c56a87c01606134975446d77013a4cdd5b5420112d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD17C 11940 bytes
font_01_sfnt_off0000f7f3.bin
22fabb0c3aa6e65863b494e97f1adc697ef0035dcd5c7e8abb257734c14c3de0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 5316 bytes
font_02_sfnt_off000109f5.bin
c0a71a382a1ebbbc1ff1fbb0537bf702e9dee5dd70265e5bce1e12758448755e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F5 11176 bytes
font_03_sfnt_off00012f61.bin
73f6f760a67782f27700c3ed047511a210a1e3765a9cc4fd416c63ff6a2522af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F61 16060 bytes

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