Malicious PDF — malware analysis report

Static analysis result for SHA-256 845d0d3208e3713d…

MALICIOUS

PDF

88.3 KB Created: 2021-06-02 06:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7971675ccbd9a823ce2b68caabd9c65a SHA-1: d2f9e836ac3bd5e45ea4d303cd7463dbc927de27 SHA-256: 845d0d3208e3713d437f4bbd16d1a30008b702f2fb8888e619561693921a9efe
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an external URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of an embedded URL suggests an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://resalured.ru/123?utm_term=photo+editor+hd+filter+camera+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366308/normal_6041632d0d63b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454809/normal_602f5046914ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416934/normal_6058a1c3702e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406516/normal_5fd7cb91bca35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480745/normal_5ffa3c4441a03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474759/normal_600644d74de46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385437/normal_606bf8608475b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456114/normal_601370837fbd6.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4384463/normal_60b6f5f23e8b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408190/normal_6002886a6b193.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://funinupun.pbworks.com/f/short_book_review_of_treasure_island.pdfIn PDF document text
    • http://biwonuv.pbworks.com/w/file/fetch/144467385/96669244031.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/w/file/fetch/144458607/how_to_get_unlimited_coins_and_keys_in_subway_surfers_ios.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144422652/tojigewujagajij.pdfIn PDF document text
    • http://gulisapil.pbworks.com/f/pobesutejidibofito.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/21517465974.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/w/file/fetch/144455835/ratowajakitidemagoz.pdfIn PDF document text
    • http://dekokos.pbworks.com/w/file/fetch/144415866/tisotutixapexupupa.pdfIn PDF document text
    • http://zegugas.pbworks.com/w/file/fetch/144425880/abstrak_ng_pananaliksik_tungkol_sa_droga.pdfIn PDF document text
    • http://mibegenav.pbworks.com/f/what_are_some_of_the_sins_in_the_bible.pdfIn PDF document text
    • http://tebejeloxid.pbworks.com/w/file/fetch/144423396/29694061926.pdfIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144427806/kozufajudira.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 5284 bytes
SHA-256: 6f85a31ce4a8fdb1a2ccdaa3b5897be6065987b6187ca8e8b7cdae69c84a9d7c
font_02_sfnt_off0001010e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010E 3412 bytes
SHA-256: 422bb143e1314daac5d408740b27b4edf1c43ff9a562c087ebc1323e21c0e84b
font_03_sfnt_off00010e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E88 10768 bytes
SHA-256: 256064a577829c90cf6b04017c50d70c44f89a550bac1883a7fcc9640c7d36f1
font_04_sfnt_off000133a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A6 17316 bytes
SHA-256: b754a9b66e6bb414032b120d9f485b0279dba14b201353844edb06fd26244e9a
font_05_sfnt_off00014ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC8 1736 bytes
SHA-256: 0d9b6ab0354368cdfa5a4e52e4dfb250ede80cec4283e48fafec0a3c1c1d30df

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