Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a67c5b5483e9e0…

MALICIOUS

PDF

76.9 KB Created: 2021-03-13 21:15:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 99ef78d7d99fa3d62c0cbffc34797546 SHA-1: d6338ecb23ad36e2f63369297220d8412e6eef5d SHA-256: 22a67c5b5483e9e0793bbd1796bf1182ca5052216fb577210fac11218813c768
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://bologen.ru/strik?utm_term=organisational+structure+of+clothing+industry PDF link annotation
    • https://cdn.sqhk.co/lenubire/hkjjBHJ/bgn_launcher_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/filodomazora/jeFhdtm/46949702089.pdfIn PDF document text
    • https://cdn.sqhk.co/nowazedadara/egjBgBO/xobuwur.pdfIn PDF document text
    • http://nurubovoxizuga.iblogger.org/16804201246.pdfIn PDF document text
    • http://dibowofu.22web.org/76001638236.pdfIn PDF document text
    • https://zusabave.weebly.com/uploads/1/3/1/4/131406295/23bbedc022f47d0.pdfIn PDF document text
    • https://xevefozivoro.weebly.com/uploads/1/3/5/3/135339272/b55aeeaf2f.pdfIn PDF document text
    • https://cdn.sqhk.co/xudevekelefe/Dtihoif/79926913150.pdfIn PDF document text
    • https://cdn.sqhk.co/jigijobofofa/igCVhhT/encyclopedia_of_life_support_systems_eolss.pdfIn PDF document text
    • https://kawikixefi.weebly.com/uploads/1/3/5/3/135388441/pulujaputesabil.pdfIn PDF document text
    • http://difavusimope.iblogger.org/notigezodopizaxakufo.pdfIn PDF document text
    • https://cdn.sqhk.co/wareberefiz/ehJW293/microsoft_planner_classification.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/hahhQgc/duplicity_make_a_sentence.pdfIn PDF document text
    • https://nofuzuvovakiba.weebly.com/uploads/1/3/1/3/131379181/fivuwekonaza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_6adc9eae5190419b913167949678b93a.pdf?index=trueIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_aabe59dcf871471bbc1c37da8a1ced6b.pdf?index=trueIn PDF document text
    • http://rikukevez.rf.gd/juruwividageravape.pdfIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_34af7bca99ce4db68ac8b13e6a33f220.pdf?index=trueIn PDF document text
    • http://dinedolorexos.rf.gd/play_store_chrome_android.pdfIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_a416085ec7064b7baba7549f85c8e8f3.pdf?index=trueIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_e2e81c81d27e42d198e77eda9edfe5c6.pdf?index=trueIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_70cb0284e43f4186bf24935f551eef72.pdf?index=trueIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_b9c62c26a7c0412aae1bc89a8ae547cf.pdf?index=trueIn 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_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 5412 bytes
SHA-256: 66361ba4c8946a5592a22f14f8373461df560d3880aab0021a47592da6f26951
font_01_sfnt_off000101ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EE 10548 bytes
SHA-256: d431754cbab25622d77e7ba8fafa44784f78300632e79e59382a8b351a9a807f