Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff4a25138600df5…

MALICIOUS

PDF

75.5 KB Created: 2021-02-16 17:56:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 74032d4a6edde0251a50dcefc769dc55 SHA-1: ebc034dc4fbee48b74944b22ca7dc3f80a2ea6a9 SHA-256: bff4a25138600df56ebc63a4a4efcc85dd2eda42d2dce5545bac8c38e9dc4179
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on link farm domains. One prominent link directs to 'crophysi.ru', a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to appliance repair, likely intended to trick users into clicking the malicious links. The presence of numerous external links and a malicious redirector strongly suggests a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=why+is+my+samsung+freezer+not+working In PDF document text
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/duzalosenoni.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/nefewodepas-solupeji-jazuwi.pdfIn PDF document text
    • https://powumebaporisav.weebly.com/uploads/1/3/4/8/134891471/9777b601906f2.pdfIn PDF document text
    • http://flylovel.com/reusable_absorbent_sheetskbzvw.pdfIn PDF document text
    • http://richmaya.site/zadakojujalemexlbh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382614/normal_5fed0b346c8ce.pdfIn PDF document text
    • http://armada.technology/current_instruction_register_examplenlmhz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501791/normal_6001241ed0f67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404490/normal_5ff8b3968caa1.pdfIn PDF document text
    • https://koxiguxizabi.weebly.com/uploads/1/3/1/1/131163763/zivovuvebadofoz.pdfIn PDF document text
    • https://wumetitazidizo.weebly.com/uploads/1/3/4/8/134885052/monuxetagipuvijas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491671/normal_5fce2cc33526e.pdfIn PDF document text
    • https://kutijodokijo.weebly.com/uploads/1/3/4/7/134706590/3bf203f68f26f0.pdfIn PDF document text
    • https://gitujibexilen.weebly.com/uploads/1/3/1/4/131406430/pemirewugulepodog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vozuxekeve.rf.gd/bupuwesuxadavana.pdfIn PDF document text
    • http://fanurumuge.epizy.com/angle_of_depression_problems.pdfIn PDF document text
    • http://fojofediwesifog.rf.gd/marolalezotarorixuzukipa.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_off0000e8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 5468 bytes
SHA-256: d63145ee1b67465942290cbc2e47b364c3a00ef93ef077174005c4a4e3c3ccb8
font_01_sfnt_off0000fb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 11028 bytes
SHA-256: 5b3d2f9c3ba09a78bd2eb29f4ed0b0b5d5f3624603b14c4c1b0ad8dbf1d855ee

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