Malicious PDF — malware analysis report

Static analysis result for SHA-256 55935ab119bdbb4f…

MALICIOUS

PDF

101.9 KB Created: 2021-01-23 05:01:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0d3f361141f75c583cc4f0c30a72c6a6 SHA-1: 73bf8b487e7bdf92a847247e90d037eba8b2477c SHA-256: 55935ab119bdbb4f5c4cbec3b246a990a0ee331321e538e5bc0211a3b2c02aff
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one identified as a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Custom harley sportster seats', likely a pretext to drive users to malicious sites. No scripts were extracted, but the presence of malicious links points towards a phishing or malware distribution campaign.

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://traffmen.ru/123?utm_term=custom+harley+sportster+seats In PDF document text
    • https://zokibiruxe.weebly.com/uploads/1/3/5/3/135326092/xemexemuxewaz.pdfIn PDF document text
    • https://litazivufili.weebly.com/uploads/1/3/4/3/134305244/9406960.pdfIn PDF document text
    • https://site-1168501.mozfiles.com/files/1168501/releduluvurositewivowed.pdfIn PDF document text
    • https://site-1166673.mozfiles.com/files/1166673/guwasexafemotirosawutodum.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/R3chdhI/tulokimosojikipoboz.pdfIn PDF document text
    • https://cdn.sqhk.co/xixumobun/rbCjjXr/xajabuxojawarusekixelu.pdfIn PDF document text
    • https://site-1254248.mozfiles.com/files/1254248/kufutujevujul.pdfIn PDF document text
    • https://cdn.sqhk.co/lazodadevab/jjhjhgT/31290165783.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/fQa8ZLx/iphone_keyboard_with_ctrl_key.pdfIn PDF document text
    • https://site-1178588.mozfiles.com/files/1178588/escape_the_lab_game.pdfIn PDF document text
    • https://zadavutuni.weebly.com/uploads/1/3/4/3/134343582/252802.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372360/normal_5fcd60f4a0eae.pdfIn PDF document text
    • https://cdn.sqhk.co/ropimipaf/1icSgie/slice_of_life_sims_4_kawaii.pdfIn PDF document text
    • https://site-1171658.mozfiles.com/files/1171658/samsung_edge_lighting_apk_xda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xofududegotu.epizy.com/64823091819.pdfIn PDF document text
    • http://rovunebezub.epizy.com/application_form_sample_japan_visa.pdfIn PDF document text
    • http://kidogip.epizy.com/assured_shorthold_tenancy_agreement_template_scotland.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_off00015230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15230 5064 bytes
SHA-256: 562554f522c8641aaff200880537a5d77fdaca2dddce64680c75164d7b9845e4
font_01_sfnt_off0001633f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1633F 11488 bytes
SHA-256: cd27cd5781c33ac1ac27d726edfcece216008931fa7ad73e7d38fc72fe0f8e3d

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