Malicious PDF — malware analysis report

Static analysis result for SHA-256 2731685ab065a691…

MALICIOUS

PDF

81.6 KB Created: 2021-03-20 23:46:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 49d48e5faa8abf5dedf00f67f60294bf SHA-1: cebce8405d588ffc1582a6720dee63feff9862f8 SHA-256: 2731685ab065a691fea40e44891a6b5a2aaa9c83160f99167d70d1f19e2dd1ef
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF link farm' and 'SEO redirector link'. The primary malicious URL identified is https://lozipotod.ru/123?utm_term=agnez+mo+pernikahan+dini, which is likely used to redirect users to malicious content or phishing pages. The presence of ClamAV and ML heuristic firings further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://lozipotod.ru/123?utm_term=agnez+mo+pernikahan+dini PDF link annotation
    • http://tlgfree.xyz/billboard_music_awards_2019_all_performancesjx4i2.pdfIn PDF document text
    • http://zoom-omsk.ru/lovonawazasomunelofojajuiu83r.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/pimodonul.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/military_course_codeag9pu.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/Fhh3gib/49927059139.pdfIn PDF document text
    • http://wavapivanuf.scienceontheweb.net/xekina.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/DjfhgF9/cat_4_ar_cleaning_tool.pdfIn PDF document text
    • http://desokore.medianewsonline.com/quantitative_research_designs_experimental_quasi-experimental_and_descriptive.pdfIn PDF document text
    • http://volosaty100.xyz/what_is_an_english_composition_essayywj2l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_8c3c2a39ec644c00a1005280f60e71dc.pdf?index=trueIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_88c018bb79b942459803979afca14710.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kigavanus/gonorrhea_guideline__2019.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/74798997749.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/accounts_receivable_balance_sheet_reconciliation.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/musatevezowapaga.pdfIn PDF document text
    • https://ee809a51-a58d-41df-a269-13688c4e1c69.filesusr.com/ugd/5f587b_af218f2d95fa4f60a50792c15ff6f038.pdf?index=trueIn PDF document text
    • http://jifazuniduvosi.epizy.com/levowemarijabanatajufumox.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/samsung_dishwasher_model_dw80j3020us_filter.pdfIn PDF document text
    • http://jilawovo.epizy.com/aviation_band_receiver_suite_manual_v4._3.pdfIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_357a14db36dc41c4bb99e56b284ed7ac.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 3352 bytes
SHA-256: ccf9fb892202b4bb2088ce8142a4053323d469e40edb26319e9635fab615566c
font_01_sfnt_off0000f294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF294 5264 bytes
SHA-256: 249c2bfa4134726074990680c53a88ec9f25cb0f9a13492e3d3f6d5d1d4d077a
font_02_sfnt_off0001044f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 6148 bytes
SHA-256: 0b38f6fd5e0b54bfa22d5adee1cfe00629fe134100fc7cfc1ad14a2ab7974207
font_03_sfnt_off0001142f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142F 10600 bytes
SHA-256: a11461abf1e703f2291785ffac758b475dee3857db205711493f68ddf2269bce