Malicious PDF — malware analysis report

Static analysis result for SHA-256 81858ac3c08286ca…

MALICIOUS

PDF

128.7 KB Created: 2021-03-22 19:39:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c95b4a8d0c93aa3c3e1aac304001ee63 SHA-1: 7d117831ebcb3f6cdcd202fce023ca66828b209d SHA-256: 81858ac3c08286ca24e31a9527ce0179e1b1e8cd0243b7b4698a4ce09168294a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a significant number of external links, suggesting a link farm designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the presence of numerous external URLs and the PDF structure itself point towards an attempt to exploit users through redirection, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jumiwimov.ru/award?keyword=rudram+namakam+chamakam+pdf+kannada PDF link annotation
    • http://galosidijixiwu.mypressonline.com/6033462946.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/lange_psychiatry_10th.pdfIn PDF document text
    • https://cdn.sqhk.co/dopiporajen/tpjcibD/civilopedia_civ_5.pdfIn PDF document text
    • https://cdn.sqhk.co/ninasodivofi/hOGTShf/todawo.pdfIn PDF document text
    • http://tixshopclub.fun/what_weapon_did_perseus_use_to_kill_medusa9eznt.pdfIn PDF document text
    • http://hr-insider.com/42765230796os10m.pdfIn PDF document text
    • https://cdn.sqhk.co/towafeniruje/oBuI7gj/c_h_a_s_e_d_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/jjhbKGA/facebook_logo_for_business_card_use.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/xaxuwopafowenezuj.pdfIn PDF document text
    • https://cdn.sqhk.co/zuwiwejagub/shfig0M/nubope.pdfIn PDF document text
    • http://jovasetiveduza.scienceontheweb.net/lipid_digestion.pdfIn PDF document text
    • http://kokolonesafu.getenjoyment.net/23126248601.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/lhcp7QK/madusuroz.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/OhhgdIR/roxagezatepe.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/hbhcohh/topup_free_fire_celcom.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_b7e36e61f04247c4a339c5b9d80e277f.pdf?index=trueIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_ddfae73b5afe4e2794e1cbc2a57ebd08.pdf?index=trueIn PDF document text
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_99310f37d09c49d08fe8ad9474dd02bb.pdf?index=trueIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_98b91af287084e28b4d27cc1ef91d4d0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/51956279460.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/60643902512.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/calendar_template_excel_file.pdfIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_dbdcecdc2f174963a10f0011ff4f60ed.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00017f49.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17F49 53544 bytes
SHA-256: 5ee10d41cd3ee53efc3f71d06c1d426835371d79c50ad2c5ab1ea603640f7845
font_00_sfnt_off0001641a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1641A 5256 bytes
SHA-256: d2f7640b3b408d3db32cc49389d6402ecbcacf20fe56f850c545b7982f2d1c12
font_01_sfnt_off000175d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175D7 2140 bytes
SHA-256: f46e6372de50a2cbde1f8bdabbbab189751cb3bd88e87a1552b81ba7dbba52c8
font_03_sfnt_off0001d295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D295 9252 bytes
SHA-256: 4607b2f1d6ddee5f947c4b4b4564984790f5c1364e236b0786d9631f359a60fd

Open this report in the interactive analyzer, or submit your own file for analysis.