Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c7cada7c83378c…

MALICIOUS

PDF

96.0 KB Created: 2021-03-04 03:22:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 23d9619ab7bb99a45ca0927f2a305c63 SHA-1: 5da0ee2bceb643ab122826b4d9b0dc23b7cfb6d5 SHA-256: d0c7cada7c83378c790c9bb905f26ef3a1d4ae75e6da6668f0d600c8838b4afe
244 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to its extensive use of link farms pointing to potentially harmful websites, disguised as educational content. The document contains numerous embedded URLs, with a critical heuristic firing for a malicious redirector link to 'dafemum.ru'. The presence of a large number of links on disposable hosting further indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://dafemum.ru/wix?keyword=lesson+4+homework+practice+simulations+answer+key In PDF document text
    • http://babysampler.com/glencoe_geometry_chapter_2-_7_answers1l1rb.pdfIn PDF document text
    • http://gtomishebs.xyz/vugopakixevikotobovbld5n.pdfIn PDF document text
    • http://gadatoreneperil.mygamesonline.org/dafurotij.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/4151116.pdfIn PDF document text
    • https://nogikukejigili.weebly.com/uploads/1/3/0/8/130873965/penusabebofunos.pdfIn PDF document text
    • http://reestr.site/mekuwokewofubep4onv.pdfIn PDF document text
    • http://mixed-rootwork.com/45158605315dxb7v.pdfIn PDF document text
    • https://bojojibapofaz.weebly.com/uploads/1/3/4/4/134478515/ebd4b7ce2.pdfIn PDF document text
    • http://stepka2016.xyz/multi_step_word_problems_worksheetz5wb7.pdfIn PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/pisike.pdfIn PDF document text
    • https://dojumavuj.weebly.com/uploads/1/3/3/9/133997280/korefajukizopagil.pdfIn PDF document text
    • http://idealslimitaly.site/esv_womens_study_bible_crosswayya426.pdfIn PDF document text
    • https://jemewifawoboxe.weebly.com/uploads/1/3/4/8/134872293/ede71d75.pdfIn PDF document text
    • https://gajifawegux.weebly.com/uploads/1/3/4/6/134649352/guduxotiroro.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
    • http://tediguku.atwebpages.com/manokaxibaba.pdfIn PDF document text
    • http://girofili.myartsonline.com/new_york_city_map_sightseeing.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_off000128c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C2 5340 bytes
SHA-256: 097fa50f3bcf06d92c8f5fb0ba3a540b0dd127d8c5de731efec226fac4b412c8
font_01_sfnt_off00013ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD2 12860 bytes
SHA-256: 7e42a32e4ec4da5b6b7064a28eb7219ce41451d44ca7cd1e4f548e24b9d7a196
font_02_sfnt_off0001646c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1646C 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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