Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc48dea05dac3f1…

MALICIOUS

PDF

80.2 KB Created: 2021-03-04 16:45:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3caea2a0f7ff818fe981381728af351b SHA-1: a066cbcbca3051f0521d98b593f0117160aa2bf1 SHA-256: 4bc48dea05dac3f159b3f31439949a8c93943be5db30b4a62b482e8407da4261
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to a 'life fitness spin bike manual', indicating a lure to trick users into visiting the malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://gimoguvi.ru/123?utm_term=life+fitness+spin+bike+manual PDF link annotation
    • http://allwoman.site/power_pro_quipp_dp600_manual43klu.pdfIn PDF document text
    • http://izzzaaa.space/22067504269gt4cw.pdfIn PDF document text
    • http://habirovradik.ru/lineare_gleichungen_mit_lsungen1o224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409627/normal_603b3db915b10.pdfIn PDF document text
    • http://zugawumaz.22web.org/5_big_tabs_insertable_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421341/normal_60072cb94f3f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465277/normal_5fdcd78fc676c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/pojiriguvosutafudixim.pdfIn PDF document text
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_1fbfdb51e24d498a858d4e28b68b0c7e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tutasujal/davitagatupogifofu.pdfIn PDF document text
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_563fe075616e40429f03a2303c68b251.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/099b091b-add9-45f4-8953-51fa493507ee/nokerir.pdfIn PDF document text
    • http://dajovufozimok.epizy.com/apk_video_streaming_di_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de901aa4-7110-455d-9f44-1a38bb517ab4/iso_9001_certification_process_in_india.pdfIn PDF document text
    • http://nufukajipopo.rf.gd/amoeba_sisters_video_recap_answer_key.pdfIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_d188d3de3cff4e4ebfeacb75a1d18265.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3396c74f-20ee-40d8-9d5c-ede014df810d/nunamowiganakivisogu.pdfIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_b9d39f13b15c48778f7e6d3b7f9ec826.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb2d99e-ee8c-4e7c-9ee5-67475249aa0d/69256576315.pdfIn PDF document text
    • http://jawolaguf.rf.gd/gupelitafepekugal.pdfIn PDF document text
    • http://xejipej.rf.gd/59982417313.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEE 5096 bytes
SHA-256: b0c9d4e92b6ff952c663c572f67c08fbc0298f4e4aecc2ea5fc467c0e005271a
font_01_sfnt_off00010c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C38 11712 bytes
SHA-256: 214511ba80d89d19e18674f590ddc8fea5e5f15899b52eb50879b48741edd5dc

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