Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba470d5a786f0a08…

MALICIOUS

PDF

86.8 KB Created: 2021-05-20 02:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: baecc5e69f4f5cf42c872d013818852d SHA-1: 7f5c0e9cd3f19c2f0142c37e15912083f79e9c90 SHA-256: ba470d5a786f0a08e588d02c8e092b24158db2c033355fa9dd759a46cdbaf3fe
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external links, including a redirector to 'jumiwimov.ru', suggesting an attempt to lead the user to a malicious site. The document's content, though heavily obfuscated, appears to be a lure related to flashing Android devices, a common pretext for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jumiwimov.ru/strik?utm_term=how+to+flash+android+device+using+adb PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455207/normal_5ff12a8a24681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411480/normal_604cc294aee24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475737/normal_602fb53c9fa0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372101/normal_5ff65dade4d73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380522/normal_6062f30f80249.pdfIn PDF document text
    • https://suvewuvasalu.weebly.com/uploads/1/3/4/7/134762181/0de14b3852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_601ee263be76d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374835/normal_5ff56297bf649.pdfIn PDF document text
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/sekedopi-tamida-wasiwu-tiwesejo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_605127d6991f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409801/normal_6067d6a47723a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478927/normal_5ff5bb321556e.pdfIn PDF document text
    • https://binikefesomeb.weebly.com/uploads/1/3/5/3/135386190/zonof_tofurepegepumod_nunodiwabipazol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483587/normal_6041844eefc88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496151/normal_601a01e0db9c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418984/normal_5ff75699cbebc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_604dd04b403b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wivunonovef/low_hurdles_height.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d395f6c8-9baa-42f3-9be7-c94de4ef3902/tokamifewajolifijar.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/o_allah_the_almighty_naat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e64a7c00-2454-4af6-b1d4-887b2d233414/mumibaweb.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/59427194109.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 5416 bytes
SHA-256: 7aa39d05cd5f1f9f043897bf74b84b1370d97f98db993c6c782439e7ff985411
font_01_sfnt_off0001194a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194A 11244 bytes
SHA-256: 35e165471cf785080a2318acfa61520e1be0796ebbb5766a7dbe70356683e2ab
font_02_sfnt_off00013f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F80 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71