Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bcf22ff7fa451a8…

MALICIOUS

PDF

95.1 KB Created: 2021-03-17 21:45:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2cee179f29f253eda83f209049c75e35 SHA-1: 9f52e6b6393be1da9bb7f7eba82c25bc51f94710 SHA-256: 7bcf22ff7fa451a8185ac0e72f989574f4f93a5872bab8448625efa7515aee73
176 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a malformed exploit stream. It contains numerous external links, with one specifically pointing to a URL that appears to be part of a link farm designed to host malicious PDFs. The presence of these links suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://bologen.ru/award?keyword=me6018+additive+manufacturing+notes+pdf PDF link annotation
    • http://euroshopmn.space/278268536114bbt9.pdfIn PDF document text
    • http://afracheat2.xyz/is_it_worth_getting_osha_certifiedn765x.pdfIn PDF document text
    • http://7lessons.space/99936553852vw81r.pdfIn PDF document text
    • http://sajogol.iblogger.org/92585813077.pdfIn PDF document text
    • http://getcreditreport.info/one_thousand_and_one_nights_story_listi0zxk.pdfIn PDF document text
    • http://jazeforip.22web.org/19694759558.pdfIn PDF document text
    • http://handler-autoscout24.com/are_there_carbs_in_an_old_fashioned11kns.pdfIn PDF document text
    • http://takodevizol.iblogger.org/27322692705.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kawuduzan.rf.gd/labuwawaro.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/36138046708.pdfIn PDF document text
    • http://zosutifajo.rf.gd/schengen_visa_application_form_switzerland.pdfIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_92029fd8d8394b268b8813c1abf38d98.pdf?index=trueIn PDF document text
    • http://fovafejixafixon.rf.gd/bluedio_ufo_plus_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/xoxatote.pdfIn PDF document text
    • https://8460bee6-64ee-4fc9-83c4-9003ce4955c6.filesusr.com/ugd/5ecadc_cea4d9d76523485c88d4852c71c9ec41.pdf?index=trueIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_23888fc9f7614b92acb98da86b2115cb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/baby_song_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/backcountry_skiing_colorado_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/romemenixafe.pdfIn PDF document text
    • http://firixafuzive.rf.gd/chilis_printable_application.pdfIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_70f50e4114944254a474c4ca345167f0.pdf?index=trueIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_8dfa2b3bbabf44998735b36674b34697.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovigebi/61259957679.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/washington_state_lottery.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_off00013151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13151 6052 bytes
SHA-256: 59dca70251ea3e458f13fc8db14ba553f1405e91e484f1de3699054fd3b88086
font_01_sfnt_off000145ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145ED 11848 bytes
SHA-256: def5afb45806e04db078e880d507de18829e1c7afa742f37125e18b98b80fd03

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