Malicious PDF — malware analysis report

Static analysis result for SHA-256 28108b3f24c2afb7…

MALICIOUS

PDF

82.8 KB Created: 2020-12-08 04:10:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 9d4b76c2c69adaf6f1061a2109dcedf8 SHA-1: 1e2c71274228c038183af50f836cd225efdf1618 SHA-256: 28108b3f24c2afb74e082bd1a77e9bad05bf2bf45927c8a739591e5956cec23b
214 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier and ClamAV also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous external links, including one pointing to a known malicious redirector, suggests an attempt to lure users to malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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://traffine.ru/strik?utm_term=slow+speed+bench+grinder In PDF document text
    • https://wusikizojig.weebly.com/uploads/1/3/4/8/134883510/nisizawudewigul.pdfIn PDF document text
    • https://wotapidedodibi.weebly.com/uploads/1/3/4/4/134475573/tuxibavexakasi.pdfIn PDF document text
    • https://mozosuroje.weebly.com/uploads/1/3/4/4/134456199/9474792.pdfIn PDF document text
    • https://bomazadoxu.weebly.com/uploads/1/3/4/4/134474586/mupozeget.pdfIn PDF document text
    • https://rujedupexiveviz.weebly.com/uploads/1/3/4/8/134874221/ee7f50675d40ddf.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://static1.squarespace.com/static/5fc0baa35687f52b6b804624/t/5fc12a01f81c9a2a0ccbf15f/1606494721749/nejaderoligoluwukugebe.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1fc7e6d49a06bb5a2eb3/1606295497352/75965383494.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/75245375253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08032784-40fd-4acc-b347-64cd9a58066a/65430140057.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28b4ea13a450babfe95ac/t/5fc6b3ee3c02f22b9dfb243e/1606857710768/54758639819.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/jojotidogowiviluroxufufuw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe01393c02f22b9dd3b8f1/1606287682025/mamunutedor.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/52832710350.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_off0000fac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 5168 bytes
SHA-256: 0bf2499f1db7de7c84fc5ae2302ba91f6b1bd881a38bf3906678a3ec10203f5f
font_01_sfnt_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 10512 bytes
SHA-256: 7347f3430814abbebf330d23b09c2154df04eaca40a49286cbca1a5815dbdc85
font_02_sfnt_off00012ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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