Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37918310ec796da…

MALICIOUS

PDF

101.4 KB Created: 2021-03-17 14:07:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2001642366b40d2c66e85aa79d32ecd SHA-1: ba22ea17d37911207eb90fac8af99b082f1b3a88 SHA-256: a37918310ec796daf9e1de5dc6beba3da5a34759778c3740971309e3a304ce94
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/123?utm_term=10+note+kalimba+sheet+music
    • https://cdn-cms.f-static.net/uploads/4450733/normal_5fe7248147bd1.pdf
    • https://cdn-cms.f-static.net/uploads/4488558/normal_6043605309718.pdf
    • https://static.s123-cdn-static.com/uploads/4490001/normal_60019b5fb1aca.pdf
    • https://cdn-cms.f-static.net/uploads/4392215/normal_602534ca28f00.pdf
    • https://static.s123-cdn-static.com/uploads/4472764/normal_5fce445ca19d7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_79a2526bc87448dc89b48a258c69edd2.pdf?index=true
    • http://nijetazum.epizy.com/40951926789.pdf
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_8594666eb6864d459f0249a5cd9abccb.pdf?index=true
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_830bd4ccb72a422f8efe85ad37604fa0.pdf?index=true
    • http://vufigenetusanu.epizy.com/todub.pdf
    • http://fipamopiwip.epizy.com/49314848654.pdf
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_364dadebe3264d039fcb1376c59597ac.pdf?index=true
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_ca45bf54842f414e9a21b823a14ec570.pdf?index=true
    • http://wapepot.rf.gd/what_is_the_best_alexa_to_buy_for_music.pdf
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_e87d28e045de4a46a11221a6e8f574c7.pdf?index=true
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_e2193fb50ff543429ca952f27a1751c8.pdf?index=true
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_0b85a2826e39453e9057eb92421b1321.pdf?index=true
    • http://godorapibiveze.epizy.com/support_definition.pdf
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_98fd9f4ee788442f9a687802f4caaa61.pdf?index=true
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_c1a65a1f63b342578d9c05fbef9b1cd4.pdf?index=true
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_fc7ae05b32e34a97addb466f5cbdfb68.pdf?index=true
    • https://0a6609f8-ec05-4c06-9017-86806a0ecaf5.filesusr.com/ugd/a9248e_7c5aa3fa871c43d689666dbe6ceb27f4.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_off000129b7.bin
e6b77af724c5d7702b20c8fec1658290953221253b394403d7640b2209a49881
pdf-font-stream PDF embedded font (sfnt) at offset 0x129B7 5128 bytes
font_01_sfnt_off00013afa.bin
6d3e16821253940ccbb180d35534343c7c2f12579be9b98e3475a46fe6758269
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFA 12168 bytes
font_02_sfnt_off00016467.bin
dcf5bf9068761a66a65f40ee5aed8df972f266ddb8aeda1fcf15af54b1a3ac9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x16467 16200 bytes
font_03_sfnt_off000179af.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x179AF 4324 bytes