Malicious PDF — malware analysis report

Static analysis result for SHA-256 341dfa1c15328dcb…

MALICIOUS

PDF

91.9 KB Created: 2021-04-26 14:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcc4904e14dda684078eb4545ba8910b SHA-1: 2351b24352ef13d882ff1723b25b577bf348a8ac SHA-256: 341dfa1c15328dcbe4403428ae82fa08a594f670628c48da5d2e2f109b47d29a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing lure. ClamAV detection and ML classification confirm its malicious nature. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=best+medium+mechs+mwo
    • http://naturagrush.space/82293517292is80r.pdf
    • https://wetolobumusu.weebly.com/uploads/1/3/4/5/134579125/6944237.pdf
    • https://setopotuvojinow.weebly.com/uploads/1/3/4/8/134877086/zibejomasa.pdf
    • http://topcreditmonitoring.info/rutizanirulimamaniwufac7quc.pdf
    • https://doritader.weebly.com/uploads/1/3/4/8/134885844/18811405e.pdf
    • http://upsbox.ru/sag_rates_for_actorswi6n2.pdf
    • http://tehnikator.ru/balancing_simple_chemical_equations_worksheetpwd5j.pdf
    • http://varistop.site/gaputiko8jd3.pdf
    • https://woxolifufoku.weebly.com/uploads/1/3/4/2/134234665/sixuwixefa.pdf
    • http://duplicwcnj.space/718484015117mcsh.pdf
    • http://bet-info.ru/mpsc_books_in_marathi_file41ocr.pdf
    • https://megefutuw.weebly.com/uploads/1/3/0/9/130969536/boditalawag-pepijunasisamo-napefimuv.pdf
    • http://winwites.space/twista_crook_county_album_downloadr0hmu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nozanela.epizy.com/47615934181.pdf
    • https://s3.amazonaws.com/lofese/isn_t_she_lovely_piano_sheet.pdf
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_c5c41bcfc38145439beed833e1609238.pdf?index=true
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_1038ec6fbb1f42e3a4f91587e688e269.pdf?index=true
    • https://s3.amazonaws.com/dowesitobuga/78607013053.pdf
    • https://s3.amazonaws.com/zodererezuzuxi/31397791303.pdf
    • https://s3.amazonaws.com/lekizopiloref/verbos_irregulares_castellano_lista.pdf
    • https://s3.amazonaws.com/sazariwapa/vagefewijolutijizi.pdf
    • http://vusomafolu.rf.gd/autokopen._nl_android_auto.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_off00012668.bin
0a4b26ac3430d011b0b70089863b01f553e5ceef309384193dae958294c60ff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12668 4984 bytes
font_01_sfnt_off0001374e.bin
ba80c7e300eef807568c73b8042a5a6946a628bffd723b42ec89fa1524b43623		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1374E 13000 bytes

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