Malicious PDF — malware analysis report

Static analysis result for SHA-256 bee7f711accedb17…

MALICIOUS

PDF

75.9 KB Created: 2021-02-20 17:51:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ecaf67c2c54ac2baa17045de6745aca8 SHA-1: f3d34fffbca498cf6ea0ad87604ead47094956b3 SHA-256: bee7f711accedb17d729760714f33a117d01004e79165231594f2fed080d5ec0
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely lead to phishing content or further malware distribution. No scripts were extracted from this sample, but the presence of numerous external links indicates a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://baarspo.ru/strik?utm_term=how+to+find+mean+from+grouped+frequency+table PDF link annotation
    • https://dutaveporope.weebly.com/uploads/1/3/4/6/134600224/f78c76dab.pdfIn PDF document text
    • https://girowotejetut.weebly.com/uploads/1/3/1/4/131406843/tibewutelofawu_lajukoli_kolevefeb_kidugeriravuzow.pdfIn PDF document text
    • https://vuminuzatadabem.weebly.com/uploads/1/3/4/3/134311796/45a4a503ec2.pdfIn PDF document text
    • https://banijeweziwi.weebly.com/uploads/1/3/4/8/134873891/8b5663d109.pdfIn PDF document text
    • http://varnisvakq.ru/trane_thermostat_xl824_instructionsghkik.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/jjjd7h0/dojikofaligopag.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/b2hjigK/pasiwakikon.pdfIn PDF document text
    • https://cdn.sqhk.co/wirubetena/ijmbRhd/real_drift_car_racing_mod_free_download.pdfIn PDF document text
    • https://derufobi.weebly.com/uploads/1/3/2/6/132682106/7430969.pdfIn PDF document text
    • http://salleapp.xyz/place_value_chart_printable1o9l1.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/XhfJjf3/two_piece_stacked_leggings_set.pdfIn PDF document text
    • http://dujoxizuzepofom.iblogger.org/31661195123.pdfIn PDF document text
    • http://fruitslope.online/alapana_movie_naa_songs4lg2z.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/ighihih/tamugetidakodel.pdfIn PDF document text
    • http://starkrobotics.org/51454864529s9ut7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bobosuvediv.epizy.com/angular_formgroup_array_example.pdfIn PDF document text
    • http://kenuzuwemonuda.epizy.com/bapafawojumit.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D5 5716 bytes
SHA-256: f5a0020156ae093c583a1e794d75ab4906bca690cf0dce451aeea19d2ed3511b
font_01_sfnt_off0000fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 11452 bytes
SHA-256: eb1411b69d3f7a92b2d5a02492820ab96b53e03a67c3ba00d6845f080bb8019f

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