Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7277249c92736b2…

MALICIOUS

PDF

104.5 KB Created: 2021-05-04 02:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc8a9dc67bedad1307c9adeb1e04ac60 SHA-1: 2786ca1cee2fcb434969582132a8622591b8c57d SHA-256: b7277249c92736b2aaee3517f9fd08457b3eab7874163cfe654a5cefe3e7afd8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and one primary malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Lg lp1213gxr disassembly'. No scripts were extracted, but the overall structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=lg+lp1213gxr+disassembly
    • http://teachost.com/ta_notification_2020hy7d8.pdf
    • https://static.s123-cdn-static.com/uploads/4389365/normal_5ff0d786f2f3b.pdf
    • https://marevesebogu.weebly.com/uploads/1/3/0/8/130813877/pejoleva.pdf
    • https://rurujopolobadez.weebly.com/uploads/1/3/4/4/134444805/3728381.pdf
    • http://copyrightshelpcenter.com/go_ask_alice_movie_free_onlinelep1a.pdf
    • http://reawont.online/did_you_hear_what_i_said_or_say9cjwy.pdf
    • https://cdn-cms.f-static.net/uploads/4428039/normal_5fdae960c0592.pdf
    • http://agreevudb.rest/world_of_warcraft_booksb7chu.pdf
    • https://static.s123-cdn-static.com/uploads/4369499/normal_60095904e8cec.pdf
    • https://static.s123-cdn-static.com/uploads/4413578/normal_5fe26525ad0c8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e2a12503-e9f4-4898-9b1e-00959bf5a9c8.filesusr.com/ugd/1f0de7_927a8ed2c4a0498e99c7868a9dd14c88.pdf?index=true
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_0a39e6e96c0045659a4ba5795ef9a21d.pdf?index=true
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_bae1e5d8d0db4676aa52d15d689ed8b4.pdf?index=true
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_cec946f37ac1487395a2c07b4bcb1c5b.pdf?index=true
    • https://aa4a64a1-c69a-4176-9ab9-82648dcabbba.filesusr.com/ugd/70701b_94d7c0faee6c44a09dee29459a4de4e5.pdf?index=true
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_140ad085c16d4302a0af759417d5283e.pdf?index=true
    • https://07305246-6d94-4033-9ce1-ead17dc2a1c9.filesusr.com/ugd/c4ccc4_8ed81eb0fe6d4cc0ab379831de12c94b.pdf?index=true
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_e619b9c1ccbb41499588ae1d558b7507.pdf?index=true
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_975e3b9863b846c3b36a2be63d0764a5.pdf?index=true
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_ca033cf602454ca9956ea439cee83f2d.pdf?index=true
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_ff9a8e92b482471489a58ed61e2f0f66.pdf?index=true
    • https://ff102949-4c65-4b7b-925c-ea9a98d885fa.filesusr.com/ugd/7a16bb_b9a7017841534448bc591fa291eb21f5.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001346b.bin
6ad1c98c2285feecb1d435d90295e665d18f36f85bae0444d08c2d6152745070
pdf-font-stream PDF embedded font (sfnt) at offset 0x1346B 5880 bytes
font_01_sfnt_off00014865.bin
8ab923703a6cb8420f8fca7bd3ad5728ba4bd58dd88d5cf9a7680080d3c28edf
pdf-font-stream PDF embedded font (sfnt) at offset 0x14865 1908 bytes
font_02_sfnt_off000151b5.bin
62b6174c77e26f746addc11511d5309f9522540fc4995efa0d7a8f290b4be8d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x151B5 12496 bytes
font_03_sfnt_off00017c23.bin
45d566bdd2704c81780b83a6bdf255ad416806c02dbf1efacdab0d4ecc1cf4d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x17C23 16444 bytes