Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a8679ca052a069…

MALICIOUS

PDF

67.3 KB Created: 2021-02-05 23:19:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d5cf2130b756e3d8bfe4c3cae28a8b22 SHA-1: 371352dd3252ea7ad26b429c16351829773e6100 SHA-256: 58a8679ca052a069065446d8f5b57f6c0c6ce344f43ca7e5271ee8991db5d54d
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to external websites, indicating a link farm or redirection strategy. One critical heuristic identified links to known malicious redirector infrastructure, and another flagged the PDF as a link farm. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's used for phishing or distributing further malware.

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 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://crophysi.ru/123?utm_term=taylor%2527s+do+it+center+paint In PDF document text
    • https://nexawukuvinu.weebly.com/uploads/1/3/4/5/134578226/7db6407688.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/i8uoqjh/strike_fighters_attack_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/Sjbgdgf/54148969153.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/Wgil9ib/semuxo.pdfIn PDF document text
    • https://cdn.sqhk.co/jigotove/kpgi19s/lexafevinituki.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/ja9hcjb/47684407637.pdfIn PDF document text
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/727131.pdfIn PDF document text
    • https://cdn.sqhk.co/rekosiseweno/PhjJjhk/call_me_emperor_facebook_login_error.pdfIn PDF document text
    • https://nobewiga.weebly.com/uploads/1/3/5/3/135315034/wivomadalopozel.pdfIn PDF document text
    • https://tapulebuzaxu.weebly.com/uploads/1/3/0/8/130814605/xejedunidojakida.pdfIn PDF document text
    • https://cdn.sqhk.co/bojidokagivi/havgfTI/zeguj.pdfIn PDF document text
    • https://dadekubezaxinis.weebly.com/uploads/1/3/2/7/132740399/9bf6b808eed2df.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/vavebufevodutob/instagram_likes_and_followers_free_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/faithful_love_hymn_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/public_speaking_samples.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/23207386289.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/english_grammar_for_dummies_uk_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/motorola_apx_6000_manual.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_off0000b66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66E 5152 bytes
SHA-256: e6809eaf0e583284a9d10daec4d4b63ac3d4515fc3792241e376cb5066bb6640
font_01_sfnt_off0000c808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC808 6552 bytes
SHA-256: 2588c57f86693cc21bd50695568ce98413f2a9a339a09201db7d17cff785c723
font_02_sfnt_off0000dd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2D 10004 bytes
SHA-256: 5cd66e560c4e2bea5a4f610a9263163dd1a7e4bdd3d8ba44cdaaf46dcab8a94b

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