Malicious PDF — malware analysis report

Static analysis result for SHA-256 556afff676685f14…

MALICIOUS

PDF

93.5 KB Created: 2021-04-30 21:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 95e5e7e6014a09fc6667717a170a5e4c SHA-1: 7eebdf9a9568f86296103cb6dde6ebfff78d5ed9 SHA-256: 556afff676685f14117cef4aa89f371bfbc1c4f7821e5ca2916c2130e96fef31
126 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 of which point to disposable domains, indicating a link farm or SEO spam campaign. The document body, though heavily obfuscated, suggests it is masquerading as a manual for a scanning tool to lure users to these external sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://zajinet.ru/strik?utm_term=innova+scan+tool+3040e+manual PDF link annotation
    • http://mutujejeturuduf.medianewsonline.com/creative_writing_prompts_worksheets.pdfIn PDF document text
    • http://nejupike.mygamesonline.org/76997399840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452376/normal_6022bda53c628.pdfIn PDF document text
    • https://fofomakizu.weebly.com/uploads/1/3/0/7/130775640/457279.pdfIn PDF document text
    • http://gixapedotamerow.mywebcommunity.org/whirlpool_wdt720padm1_service_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443821/normal_601c601a5a088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418970/normal_5fdbdfa5a1e1f.pdfIn PDF document text
    • https://wujabadatudipox.weebly.com/uploads/1/3/5/4/135400083/risuvesusor_rufavefeg_xivawenuxutawa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489241/normal_6038c53c10fdf.pdfIn PDF document text
    • http://wusumomijo.medianewsonline.com/bark_at_the_moon_solo_tab.pdfIn PDF document text
    • http://drive4mclaneaustell.com/evolution_of_multicellular_life_worksheet_answers2jpgp.pdfIn PDF document text
    • http://prizinsta24.space/45448464010bbm6.pdfIn PDF document text
    • http://nerroba.info/vajevejyi5nc.pdfIn PDF document text
    • https://raxelapanaf.weebly.com/uploads/1/3/4/7/134746791/zuxejudapar.pdfIn PDF document text
    • https://bewirupudafa.weebly.com/uploads/1/3/1/6/131607000/sekon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedisijusa.onlinewebshop.net/fractions_math_exercises.pdfIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_27427cea543040d79f11fa39451836e1.pdf?index=trueIn PDF document text
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_646ad49afa774dda9e0e2044bf328188.pdf?index=trueIn PDF document text
    • https://170d08c7-2527-4f8e-8bc4-cf7f6ffab704.filesusr.com/ugd/afe24e_b71f078129394f4cb03f05bbdd53253f.pdf?index=trueIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_df3808b244914efe84ccb684792ccc77.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_c81c221c7b9942d7a696dd8569a618df.pdf?index=trueIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_e7de63ff98fa48f4a300157ee39a1101.pdf?index=trueIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_4516274977ef402aaf08fb403e48e649.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_off00012ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB0 5240 bytes
SHA-256: f831530e6429d5f0e893ea325872b8b168635ec38a0a2e0f1b69907bafc6fd80
font_01_sfnt_off00013c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7C 13204 bytes
SHA-256: 10512de7a5a6d2a1761737ba3101764ebdda93174f1d66a3284c17140508fbbb