Malicious PDF — malware analysis report

Static analysis result for SHA-256 7abbbf63d1e36e2e…

MALICIOUS

PDF

88.8 KB Created: 2021-02-15 15:52:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8c092bc2c4fbc74e751d2017bd791fdc SHA-1: 6c2af20ddb8d9280ff8fddb06694bedddfae692b SHA-256: 7abbbf63d1e36e2e5663e9e67e02db0fbb210195aa2cad3da99817c8e5774d85
184 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, with critical heuristics indicating it functions as a redirector to known malicious infrastructure. The embedded URLs, such as 'https://yafferge.ru/aws?utm_term=what+happens+in+the+tattooist+of+auschwitz', are likely used to deliver phishing content or further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • 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://yafferge.ru/aws?utm_term=what+happens+in+the+tattooist+of+auschwitz In PDF document text
    • https://cdn.sqhk.co/guledijuxi/iigjjj5/83653483685.pdfIn PDF document text
    • https://fifubinagate.weebly.com/uploads/1/3/4/8/134854053/revaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402948/normal_5fed5b2743de3.pdfIn PDF document text
    • https://vumifedesonuzik.weebly.com/uploads/1/3/4/8/134849268/70585a3b7.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/El3jhgj/zerado.pdfIn PDF document text
    • https://tipiwaterexiw.weebly.com/uploads/1/3/3/9/133997214/sukitepekusever.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446390/normal_5fe2d1e5ca097.pdfIn PDF document text
    • http://tiwelonepozafuw.iblogger.org/skoda_amundsen_2019_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dikewovob.epizy.com/37348405054.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/xesotijexumebevozal.pdfIn PDF document text
    • http://mukoluduxoge.rf.gd/3380983158.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/41757201824.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF856 5132 bytes
SHA-256: 8765fb8d27454e5fb6182f8fc3b248c58f8c4b57d55ab8666b04d8100f84eef3
font_01_sfnt_off000109f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F4 11572 bytes
SHA-256: 42507d35deba9fda9445fee204d160c37b4c1bc86a7528c5ec304b23371ac76d
font_02_sfnt_off00013088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13088 21940 bytes
SHA-256: d3fa500dba6dc62f1ae0041a82b8bc564e8daecae17084a1fd0a548bc9cf787c

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