Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab4d304df7cc822…

MALICIOUS

PDF

71.1 KB Created: 2021-02-23 04:56:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ce8d50c0b4174d3adc01c578463d4c6f SHA-1: 19bc8f5345025d50b3366b5fb17a4d1c493f6fd1 SHA-256: fab4d304df7cc822d0ebbe4fde4e49f576106bd5b2e3488764ed764dd2fdef63
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The document contains numerous embedded URLs pointing to disposable hosting, suggesting a phishing or scam attempt to redirect users to malicious sites. No scripts were extracted, but the presence of many links indicates a focus on external redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=define+derechos+humanos In PDF document text
    • https://cdn.sqhk.co/zejizoguzut/idhi2ji/black_country_music_hall_of_fame_members.pdfIn PDF document text
    • https://vemetufubejukat.weebly.com/uploads/1/3/4/3/134367776/6174668.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/cLKbUgc/dwyane_wade_wife_net_worth.pdfIn PDF document text
    • http://domen3.club/instructions_on_how_to_play_balderdashzd0i0.pdfIn PDF document text
    • https://fetibafavi.weebly.com/uploads/1/3/0/7/130776688/5150656.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/aihPied/the_trip_to_greece_streaming_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/h5iewjk/what_does_teddy_do_in_granny_horror_game.pdfIn PDF document text
    • https://rojaduvesasesa.weebly.com/uploads/1/3/4/7/134751848/87a10777cee39.pdfIn PDF document text
    • http://perevod24-card2card.site/atlas_biblico989zy.pdfIn PDF document text
    • http://extrameets.fun/kepijgcwc0.pdfIn PDF document text
    • http://shoplus.info/4588891533r3ewx.pdfIn PDF document text
    • https://lojodisomu.weebly.com/uploads/1/3/4/0/134042672/8320579.pdfIn PDF document text
    • https://cdn.sqhk.co/bipuzojafa/KjjBMhj/drift_ride_apk.pdfIn PDF document text
    • https://tukuboxux.weebly.com/uploads/1/3/4/5/134510407/tusixa.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/69033726133s01si.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sefabe/kumekosalamimawem.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/bodies_that_matter_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/decimals_to_fractions_worksheets_4th_grade.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_off0000d6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 5228 bytes
SHA-256: c9bf10cf54e8805ee46bdb97bbc637a0117cefec1db8899397a534acb0cf9095
font_01_sfnt_off0000e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 11644 bytes
SHA-256: c4a05064ad67f7e9968d93e65bb2490590e436867c1085d6cb8495d41713ab13

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